js实现显示手机号码效果

时间:2020-05-15 yonghuming 人气:0

效果图：

代码如下：

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>telephone number</title>
<style>
*{
    margin:0;
    padding:0;
}
form{
    width:300px;
    position:relative;
    margin:10px;
}
fieldset{
    padding:10px;
    border:1px dashed #ddd;
}
#num_info{
    display:none;
    position:absolute;
    left: 11px;
    bottom: 37px;
    width: 170px;
    height:30px;
    border:1px solid #ddd;
    border-bottom:none;
    background-color:#f6f6f6;
    font:20px/30px verdana,arial;
    color:#F90;    
}
#num{
    width:170px;
    height:24px;
    line-height:24px;
    margin-top:40px;
    border:1px solid #bbb;
}
#num:focus{
    outline:none;
    border-color:#999;
}
p{
    font-size:12px;
    color:#999;
}
</style>
</head>
<body>
<form>
    <fieldset>
        <label id="num_info" for="num"></label>
        <input type="text" id="num" maxlength="11">
    </fieldset>
</form>
<script>
window.onload=function(){
    var $numInfo=document.getElementById('num_info'),
        $num=document.getElementById('num'),
        _val,_val1,_val2;
    $num.onkeyup=function(){
        var val=this.value=this.value.replace(/[^\d]/g,''),
            len=val.length;    
        if(val!=''){$numInfo.style.display='block';}
        if(len<=3){
            _val=_val1= val.substr(0,3);
        }
        else if(len>3&&len<=7){
            _val=_val2=_val1+"-"+val.substr(3,len);
        }
        else if(len>7){
            _val=_val2+'-'+val.substr(7,len);
        }
        $numInfo.innerHTML=_val;
    }
    $num.onblur=function(){
        $numInfo.style.display='none';        
    }
}
</script>
</body>
</html>

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